I don't know if this is a feature or not, but what I'm looking to do is not constantly scaling my brush size when i switch between brushes. I'll give you an example.

Last night i was doing a linework piece so I was switching between a brush and an eraser brush. When I would switch back to the brush it would go back to it's default size and I would have to scale it down to about where i thought i had it.

Is there a way to not do this?

Go to Edit brush settings, or F5, there in the window that opens, at the bottom there check the button that says Temporarily Save Tweaks To Presets right after the button that says Default preset.

I also like to have a Reset to original shortcut, that makes it easier to reset on the fly when I need it (instead of clicking the button at the top).